Total Body Surface Area-  Rule of Nines

ANATOMIC STRUCTURE ADULT CHILD
Anterior head 4.5% 8.5%
Posterior head 4.5% 8.5%
Anterior torso 18% 18%
Posterior torso 18% 18%
Each Anterior Leg 9% 6.5%
Each Posterior Leg 9% 6.5%
Each Anterior Arm 4.5% 4.5%
Each Posterior Arm 4.5% 4.5%
Genitalia/Perineum 1% 1%
     
ANATOMIC STRUCTURE ADULT, OBESE & >80 kg INFANTS <10 kg
Head & Neck 2% 20%
Anterior Torso 25% 16%
Posterior Torso 25% 16%
Each Leg 20% 16%
Each Arm 5% 8%
Genitalia/Perineum 0% 1%
     
(1) O'Sullivan SB, Schmitz TJ. Phys Rehabilitation 5th ed. FA Davis Co., Philadelphia. 2007. p. 1098, Fig 27.9